Study on the Advanced Treatment of Printing and Dyeing Wastewater by Fenton Oxidation

2014 ◽  
Vol 1010-1012 ◽  
pp. 805-808
Author(s):  
Xiu Wen Wu ◽  
Ping Ma ◽  
Hui Xia Lan ◽  
Heng Zhang ◽  
Shan Hong Lan
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Treatment Effect ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Advanced Treatment ◽  
Dyeing Wastewater ◽  
Printing And Dyeing Wastewater ◽  
Cod Removal Efficiency

The influence of H2O2、addition of Fe2+、pH、reaction time and temperature to advanced treatment effect of printing and dyeing wastewater with Fenton oxidation was studied. The results showed that when the addition of H2O2(the concentration was 30%) was 3mL/L,the addition of FeSO4·7H2O was 1.6g/L,pH was 4,the temperature was about 30°C,reacting time was 35min,the COD removal efficiency achieved above 55%,COD of effluent was below 45mg/L.

Flocculant Screening for the Pretreatment of Printing and Dyeing Wastewater

2014 ◽  
Vol 1010-1012 ◽  
pp. 761-764
Author(s):  
Shan Hong Lan ◽  
Ping Ma ◽  
Shi Wen Geng ◽  
Jia Hao Sun ◽  
Hui Xia Lan ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Treatment Effect ◽  
Treatment Effects ◽  
Cod Removal ◽  
Dyeing Wastewater ◽  
Treatment Efficiency ◽  
Printing And Dyeing Wastewater ◽  
Cod Removal Efficiency ◽  
Optimum Ph ◽  
Addition Amount

Study on the pretreatment of printing and dyeing wastewater with PAC、Fe2(SO4)3and FeCl3was carried out. Effects of the flocculants dosage, pH on the treatment efficiency were studied. The results showed that with PAC, Fe2(SO4)3and the FeCl3dosage rising, the treatment effect first decreased and then increased and when the addition amount was 300 mg.L-1、300mg.L-1and 250 mg.L-1,the COD removal efficiency achieved 69%、78%、74% , respectively. With the rising of pH, the treatment effects of the three types of flocculants increased first and then decreased, the optimum pH of PAC and Fe2(SO4)3was 7and the best pH of FeCl3was 6. At last, the settle ability and the amount of the producing floc were studied, the results showed that the settle ability was the best and the least amount of sludge produced by FeCl3flocculation. Keywords: printing and dyeing wastewater, pretreatment, flocculants, screening.

scholarly journals Treatment of oilfield wastewater by combined process of micro-electrolysis, Fenton oxidation and coagulation

2017 ◽  
Vol 76 (12) ◽  
pp. 3278-3288 ◽  
Author(s):  
Zhenchao Zhang
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Treatment Process ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Oily Wastewater ◽  
Optimum Conditions ◽  
Combined Process ◽  
Cod Removal Efficiency ◽  
Optimized Conditions

Abstract In this study, a combined process was developed that included micro-electrolysis, Fenton oxidation and coagulation to treat oilfield fracturing wastewater. Micro-electrolysis and Fenton oxidation were applied to reduce chemical oxygen demand (COD) organic load and to enhance organic components gradability, respectively. Orthogonal experiment were employed to investigate the influence factors of micro-electrolysis and Fenton oxidation on COD removal efficiency. For micro-electrolysis, the optimum conditions were: pH, 3; iron-carbon dosage, 50 mg/L; mass ratio of iron-carbon, 2:3; reaction time, 60 min. For Fenton oxidation, a total reaction time of 90 min, a H2O2 dosage of 12 mg/L, with a H2O2/Fe2+ mole ratio of 30, pH of 3 were selected to achieve optimum oxidation. The optimum conditions in coagulation process: pH, cationic polyacrylamide dosage, mixing speed and time is 4.3, 2 mg/L, 150 rpm and 30 s, respectively. In the continuous treatment process under optimized conditions, the COD of oily wastewater fell 56.95%, 46.23%, 30.67%, respectively, from last stage and the total COD removal efficiency reached 83.94% (from 4,314 to 693 mg/L). In the overall treatment process under optimized conditions, the COD of oily wastewater was reduced from 4,314 to 637 mg/L, and the COD removal efficiency reached 85.23%. The contribution of each stage is 68.45% (micro-electrolysis), 24.07% (Fenton oxidation), 7.48% (coagulation), respectively. Micro-electrolysis is the uppermost influencing process on COD removal. Compared with the COD removal efficiency of three processes on raw wastewater under optimized conditions: the COD removal efficiency of single micro-electrolysis, single Fenton oxidation, single coagulation is 58.34%, 44.88% and 39.72%, respectively. Experiments proved the effect of combined process is marvelous and the overall water quality of the final effluent could meet the class III national wastewater discharge standard of petrochemical industry of China (GB8978-1996).

scholarly journals Treatment of simulated printing and dyeing wastewater using ozone microbubble

2021 ◽  
Vol 261 ◽  
pp. 04005
Author(s):  
Emmanuel Nkudede ◽  
Husseini Sulemana ◽  
Bo Zhang ◽  
Kaida Zhu ◽  
Shan Hu ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Methylene Blue ◽  
Removal Efficiency ◽  
Human Life ◽  
Cod Removal ◽  
Dyeing Wastewater ◽  
Flow Rates ◽  
Printing And Dyeing Wastewater ◽  
Cod Removal Efficiency ◽  
Initial Ph

Owing to its widespread and persistent usage, methylene blue (MB) is an environmental substance, mostly found in the printing and dyeing industry that raises concerns in the environment recently by posing significant threat to human life and the ecosystem as a whole. Thus, there is the need to effectively manage and treat the wastewater from these industries before reaching to the available water sources. Ozonation treatment is very efficient in treating printing and dyeing wastewater (MB) and can be greatly improved by using micro-bubble technology. Microbubble dissolution is an effective way to improve the rate of ozone mass transfer. To discover these properties, a method was used to improve the mass transfer of ozone microbubbles, which was used to effectively treat simulated printing and dyeing wastewater. We investigated the effects of pH, water temperature, ozone flow, and other conditions on the dissolution and attenuation properties of ozone in methylene blue microbubble solutions. Treatment of simulated printing and dyeing wastewater (methylene blue) was investigated under various initial pH and ozone flow rates. A catalytic exhibition was performed towards the decolorization of methylene blue (MB) concentrations and the corresponding COD removal efficiency. Ozone depletion and pH levels played key roles in MB degradation. Under high pH level of 11.01, the rate of removal of COD was 93.5%. Ozone dosage also has direct effect on COD removal efficiency and decolorization. Higher ozone flow rates, 0.4 L/min and 0.5 L/min recorded more than 94% degradation of COD thus very effective and efficient. Also, ozone flow rates 0.3 L/min, 0.4 L/min and 0.5 L/min with initial pH, 7.03, 6.63 and 6.36 decreased to 3.43, 3.49 and 3.44 after reaction processes which clearly shows that with high ozone dosage, pH reduces considerably.

Effect of pH on Advanced Treatment of Mid-Stage Pulping Effluent with Potassium Ferrate

2013 ◽  
Vol 781-784 ◽  
pp. 2146-2149
Author(s):  
Shan Hong Lan ◽  
Rui Chen ◽  
Ping Ma ◽  
Hui Xia Lan ◽  
Yong Dong Wang
Keyword(s):  
Removal Efficiency ◽  
Cod Removal ◽  
Effluent Treatment ◽  
Advanced Treatment ◽  
Potassium Ferrate ◽  
Effect Of Ph ◽  
Cod Removal Efficiency ◽  
Effects Of Ph ◽  
Alkaline Conditions ◽  
The Stability

The effects of pH on the advanced treatment of mid-stage pulping effluent with potassium ferrate were studied. Firstly, the effect of pH on the stability of the potassium ferrate solution was studied, which indicated that potassium ferrate was more stable in alkaline conditions than in acidic and neutral conditions, and the most stability was achieved at pH of 9-10. Then the effect of pH on the mid-stage pulping effluent treatment with potassium ferrate showed that the oxidation increased firstly and then decreased with the increase of the pH. The best treatment efficiency was at pH=4, under which COD removal efficiency reached 40%. The flocculation experiment was conducted using Fe3+ produced by the oxidation reaction as flocculant and PAC as extra flocculant and PAM as coagulant aid. Effect of pH on the flocculation process was studied, which showed that the flocculation effect first increased and then decreased with pH increasing. When pH was 9, COD removal efficiency reached 60%. The final effluent of COD concentration was less than 60mg/L, which met the requirements from the national first-order discharge standard.

Study on Treatment of Polytetrahydrofuran Wastewater by Iron-Carbon Micro Electrolysis

2013 ◽  
Vol 295-298 ◽  
pp. 1307-1310
Author(s):  
Xi Tian ◽  
Ming Xin Huo ◽  
De Jun Bian ◽  
Sheng Shu Ai ◽  
Qing Kai Ren
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Contact Time ◽  
Ph Value ◽  
Removal Rate ◽  
Volume Ratio ◽  
Cod Removal ◽  
Electrolysis Process ◽  
Cod Removal Efficiency ◽  
Cod Removal Rate

The wastewater produced from the polytetrahydrofuran (PolyTHF) was treated with iron-carbon micro electrolysis process. This paper had studied the COD removal efficiency influences of primary PH value, reaction time, the quality ratio of the iron-carbon, the quality and volume ratio of Fe-wastewater. The results show that when pH value is 3, the quality ratio of the iron-carbon is 11 and the quality and volume ratio of Fe and wastewater is 17 with contact time of 90 min, the wastewater COD removal rate can reach as high as 95.0%.

Study of Printing and Dyeing Wastewater Treatment by Membrane Bioreactor Enhanced by Bio-Ferric

2011 ◽  
Vol 183-185 ◽  
pp. 1456-1461 ◽  
Author(s):  
Shi Feng Ji ◽  
Chun Mei Gao ◽  
Hong Yang ◽  
Ming Chu ◽  
Chun Feng Wang
Keyword(s):  
Removal Efficiency ◽  
Membrane Bioreactor ◽  
Ferric Hydroxide ◽  
Cod Removal ◽  
Printing And Dyeing Wastewater ◽  
Sludge Flocs ◽  
Cod Removal Efficiency ◽  
N Removal ◽  
Sludge Minimization ◽  
Better Than

Bio-ferric membrane bioreactor(MBR) was made through adding ferric hydroxide to traditional MBR and forming bio-ferric sludge. Through analyzing treatment efficiency of dyeing and printing wastewater in bio-ferric MBR and traditional MBR respectively, the results showed: COD removal efficiency in bio-ferric MBR was more better than that in traditional MBR which increased 10% or so, but the influence of HRT on COD removal efficiency wasn’t evident; Via changing SRT, it was obtained: bio-ferric MBR could operate in longer SRT while treatment effect couldn’t be impacted that could discharge less sludge than traditional MBR which coule get sludge minimization; bio-ferric sludge flocs could provide better survival environment for nitrobacteria that made NH3-N removal efficiency stable. The experiment illuminated: the biochemical and physical function of bio-ferric sludge could strengthen the holistic stability of the system.

Removal of Dye from Textile Dyeing Wastewater by Using Oxidized Multiwalled Carbon Nanotubes

2011 ◽  
Vol 343-344 ◽  
pp. 193-198
Author(s):  
Wen Yan Shi ◽  
Jian Zhong Gu ◽  
Wen Jing Wu ◽  
Yan Feng Sun ◽  
Rui Yun Guo ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Removal Efficiency ◽  
Cod Removal ◽  
Dyeing Wastewater ◽  
Multiwalled Carbon ◽  
Cod Removal Efficiency ◽  
Textile Dyeing ◽  
Irradiation Dosage ◽  
Textile Dyeing Wastewater

The batch removal of dye from textile dyeing wastewater by using nanooxides decorated multiwalled carbon nanotubes was studied under electron beam conditions. The effect of different nanooxides decorated multiwalled carbon nanotubes content and irradiation dosage was also investigated. The color removal efficiency was 94.9% in dose of 17.5kGy. The colour removal efficiency with Fe2O3 decorated multiwalled carbon nanotubes was similar to with TiO2 decorated multiwalled carbon nanotubues. The COD removal efficiency was 52.5% in the dose of 14.0kGy. When the irradiation dose of 17.5kGy, the COD removal efficiency was 98.2% with TiO2 decorated multiwalled carbon nanotubes.Overall, the study demonstrated that nanooxides decorated multiwalled carbon nanotubes can effectively remove color and COD from aqueous solution under irradiation.

Study on Treatment of Dyeing Wastewater by Fe0-H2O2 System

2014 ◽  
Vol 1048 ◽  
pp. 507-510
Author(s):  
Shan Hong Lan ◽  
Chuan Lu Wang ◽  
Jia Hao Sun ◽  
Heng Zhang
Keyword(s):  
Waste Water ◽  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Waste Water Treatment ◽  
Advanced Treatment ◽  
Dyeing Wastewater ◽  
Biochemical Treatment ◽  
Printing And Dyeing Wastewater ◽  
Initial Ph ◽  
Biochemical Degradation

Printing and dyeing wastewater contained difficult biochemical degradation of organic matters. It required advanced treatment after the biochemical treatment. In this paper, effeccts of pH, the amount of iron and hydrogen peroxide, the ratio of iron and hydrogen peroxide and reaction time on the Fe0-H2O2system were studied. The results showed that all the above factors were important to dyeing waste water treatment by Fe0-H2O2system. CODCrremoval efficiency could archive 65% when the initial pH was 3, the iron powder capacity was 1.5g/L,the volume of hydrogen peroxide was 1ml/L, the reaction time was 40 min and the temperature was 30°C.

Treatment of Sodium Formate Wastewater by Fenton Oxidation Process

2012 ◽  
Vol 573-574 ◽  
pp. 627-630
Author(s):  
Zhi Gang Chen ◽  
Rui Xue Zhang ◽  
Bo Zhang ◽  
An Ping Wei
Keyword(s):  
Reaction Time ◽  
Removal Efficiency ◽  
Oxidation Process ◽  
Ph Value ◽  
Sodium Formate ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Fenton Process ◽  
Initial Ph ◽  
Fenton Oxidation Process

In this study, in order to reduce the sodium formate concentration thereby reducing toxicity, the treatment of this wastewater by Fenton process was investigated. The effects of initial PH value, reaction time, concentration of FeSO4• 7H2O, and H2O2 dosage on the removal efficiency of COD were studied respectively. The experiment results show that when using Fenton oxidization pretreatment process, with pH 2.0, FeSO4•7H2O concentration 4000mg/L, H2O2(30 % ) portion 4ml/L, and reaction time 20min, COD removal efficiency was more than 50%, oxidization efficiency was good.

Study on the Advanced Treatment of Pulp and Paper Wastewater by Fenton Oxidation and its Comparison with Ozone Oxidation

2013 ◽  
Vol 726-731 ◽  
pp. 1744-1750 ◽  
Author(s):  
Li Jun Huang ◽  
Li Ying Song ◽  
Hong You Wan ◽  
Ke Zeng
Keyword(s):  
Reaction Time ◽  
Treatment Effect ◽  
Removal Rate ◽  
Pulp And Paper ◽  
Cod Removal ◽  
Fenton Oxidation ◽  
Ozone Oxidation ◽  
Continuous Increase ◽  
Paper Wastewater ◽  
Cod Removal Rate

The treatment on the secondary biochemical effluent of pulp and paper wastewater by Fenton oxidation was studied and the influence of H2O2dosage, Fe2+dosage, pH and reaction time on the treatment effect was investigated by the orthogonal test and single-factor test. The treatment effect was eminent when the H2O2dosage was 3.75mmol/L, Fe2+dosage was 3.20mmol/L, pH was 4.00 and the reaction time was 80.00min. The removal rate of UV254and chromaticity significantly increased as H2O2dosage was 1.88 ~ 3.75mmol /L, but the COD removal rate declined as H2O2dosage was more than 2.81mmol/L; each removal rate increased and then decreased slightly with the increase of Fe2+dosage, each removal rate dropped obviously as pH was more than 5.00; within 80.00min, the removal rate increased significantly, it changed little with the continuous increase of reaction time. Under the optimal conditions, the COD removal with Fenton oxidation was more effective and its removal rate could achieve 88.33%, it was advantageous compared with ozone oxidation; but the elimination effect of UV254and chromaticity to pulp and paper wastewater with ozone oxidation was better, the two removal rate achieved 83.70% and 92.00% in a short time, respectively. Although it could reach such a removal effect by Fenton oxidation, it did not have the superiority in reaction time.

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